Originally Posted by
Mark Elberson
You could try setting your pop-up flash to rear curtain and have that trigger you Vivitar optically (that would require that you have an optical slave of course). I am not aware of any other way to accomplish this, but maybe Sean will...
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An optical slave would be my suggestion as well (and, if I remember correctly, the LP160 does have a built-in optical slave). You'll need to make sure you turn off all forms of pre-flash (like AF assist or E-TTL) on the camera.